X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Flib%2Flibudev-util.c;h=7053a2f82554726508bd39110f526233b7a1259d;hp=dfd5f3c3fb0af26d1f6c5cc046e1eb3ecf1365a5;hb=c68a2936786f973ce1e249c6c33f48adc63ac709;hpb=b2946df41965632c80012921a2cacbf83bc3dd80

diff --git a/udev/lib/libudev-util.c b/udev/lib/libudev-util.c
index dfd5f3c3f..7053a2f82 100644
--- a/udev/lib/libudev-util.c
+++ b/udev/lib/libudev-util.c
@@ -26,22 +26,22 @@
 #include <errno.h>
 #include <string.h>
 #include <dirent.h>
+#include <ctype.h>
+#include <fcntl.h>
 #include <sys/stat.h>
 
 #include "libudev.h"
 #include "libudev-private.h"
-#include "../udev.h"
 
-static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *devpath, char *subsystem, size_t size)
+static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *syspath, char *subsystem, size_t size)
 {
-	char path[PATH_SIZE];
+	char path[UTIL_PATH_SIZE];
 	ssize_t len;
 	const char *pos;
 
-	strlcpy(path, udev_get_sys_path(udev), sizeof(path));
-	strlcat(path, devpath, sizeof(path));
-	strlcat(path, "/", sizeof(path));
-	strlcat(path, slink, sizeof(path));
+	util_strlcpy(path, syspath, sizeof(path));
+	util_strlcat(path, "/", sizeof(path));
+	util_strlcat(path, slink, sizeof(path));
 	len = readlink(path, path, sizeof(path));
 	if (len < 0 || len >= (ssize_t) sizeof(path))
 		return -1;
@@ -50,59 +50,51 @@ static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *de
 	if (pos == NULL)
 		return -1;
 	pos = &pos[1];
-	return strlcpy(subsystem, pos, size);
+	return util_strlcpy(subsystem, pos, size);
 }
 
-ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
+ssize_t util_get_sys_subsystem(struct udev *udev, const char *syspath, char *subsystem, size_t size)
 {
-	return get_sys_link(udev, "subsystem", devpath, subsystem, size);
+	return get_sys_link(udev, "subsystem", syspath, subsystem, size);
 }
 
-ssize_t util_get_sys_driver(struct udev *udev, const char *devpath, char *driver, size_t size)
+ssize_t util_get_sys_driver(struct udev *udev, const char *syspath, char *driver, size_t size)
 {
-	return get_sys_link(udev, "driver", devpath, driver, size);
+	return get_sys_link(udev, "driver", syspath, driver, size);
 }
 
-int util_resolve_sys_link(struct udev *udev, char *devpath, size_t size)
+int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
 {
-	char link_path[PATH_SIZE];
-	char link_target[PATH_SIZE];
+	char link_target[UTIL_PATH_SIZE];
+
 	int len;
 	int i;
 	int back;
 
-	strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
-	strlcat(link_path, devpath, sizeof(link_path));
-	len = readlink(link_path, link_target, sizeof(link_target));
+	len = readlink(syspath, link_target, sizeof(link_target));
 	if (len <= 0)
 		return -1;
 	link_target[len] = '\0';
-	dbg(udev, "path link '%s' points to '%s'\n", devpath, link_target);
+	dbg(udev, "path link '%s' points to '%s'\n", syspath, link_target);
 
 	for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
 		;
-	dbg(udev, "base '%s', tail '%s', back %i\n", devpath, &link_target[back * 3], back);
+	dbg(udev, "base '%s', tail '%s', back %i\n", syspath, &link_target[back * 3], back);
 	for (i = 0; i <= back; i++) {
-		char *pos = strrchr(devpath, '/');
+		char *pos = strrchr(syspath, '/');
 
 		if (pos == NULL)
 			return -1;
 		pos[0] = '\0';
 	}
-	dbg(udev, "after moving back '%s'\n", devpath);
-	strlcat(devpath, "/", size);
-	strlcat(devpath, &link_target[back * 3], size);
+	dbg(udev, "after moving back '%s'\n", syspath);
+	util_strlcat(syspath, "/", size);
+	util_strlcat(syspath, &link_target[back * 3], size);
 	return 0;
 }
 
-struct util_name_entry {
-	struct list_head node;
-	char *name;
-	int *i;
-};
-
 struct util_name_entry *util_name_list_add(struct udev *udev, struct list_head *name_list,
-					   const char *name, int sort)
+					   const char *name, const char *value, int sort)
 {
 	struct util_name_entry *name_loop;
 	struct util_name_entry *name_new;
@@ -122,10 +114,23 @@ struct util_name_entry *util_name_list_add(struct udev *udev, struct list_head *
 		}
 	}
 
+	name_new = malloc(sizeof(struct util_name_entry));
+	if (name_new == NULL)
+		return NULL;
+	memset(name_new, 0x00, sizeof(struct util_name_entry));
 	name_new->name = strdup(name);
-	if (name_new->name == NULL)
+	if (name_new->name == NULL) {
+		free(name_new);
 		return NULL;
-	dbg(udev, "adding '%s'\n", name_new->name);
+	}
+	if (value != NULL) {
+		name_new->value = strdup(value);
+		if (name_new->value == NULL) {
+			free(name_new);
+			return NULL;
+		}
+	}
+	dbg(udev, "adding '%s=%s'\n", name_new->name, name_new->value);
 	list_add_tail(&name_new->node, &name_loop->node);
 	return name_new;
 }
@@ -138,6 +143,7 @@ void util_name_list_cleanup(struct udev *udev, struct list_head *name_list)
 	list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
 		list_del(&name_loop->node);
 		free(name_loop->name);
+		free(name_loop->value);
 		free(name_loop);
 	}
 }
@@ -212,3 +218,222 @@ void util_remove_trailing_chars(char *path, char c)
 	while (len > 0 && path[len-1] == c)
 		path[--len] = '\0';
 }
+
+size_t util_strlcpy(char *dst, const char *src, size_t size)
+{
+	size_t bytes = 0;
+	char *q = dst;
+	const char *p = src;
+	char ch;
+
+	while ((ch = *p++)) {
+		if (bytes+1 < size)
+			*q++ = ch;
+		bytes++;
+	}
+
+	/* If size == 0 there is no space for a final null... */
+	if (size)
+		*q = '\0';
+	return bytes;
+}
+
+size_t util_strlcat(char *dst, const char *src, size_t size)
+{
+	size_t bytes = 0;
+	char *q = dst;
+	const char *p = src;
+	char ch;
+
+	while (bytes < size && *q) {
+		q++;
+		bytes++;
+	}
+	if (bytes == size)
+		return (bytes + strlen(src));
+
+	while ((ch = *p++)) {
+		if (bytes+1 < size)
+		*q++ = ch;
+		bytes++;
+	}
+
+	*q = '\0';
+	return bytes;
+}
+
+/* count of characters used to encode one unicode char */
+static int utf8_encoded_expected_len(const char *str)
+{
+	unsigned char c = (unsigned char)str[0];
+
+	if (c < 0x80)
+		return 1;
+	if ((c & 0xe0) == 0xc0)
+		return 2;
+	if ((c & 0xf0) == 0xe0)
+		return 3;
+	if ((c & 0xf8) == 0xf0)
+		return 4;
+	if ((c & 0xfc) == 0xf8)
+		return 5;
+	if ((c & 0xfe) == 0xfc)
+		return 6;
+	return 0;
+}
+
+/* decode one unicode char */
+static int utf8_encoded_to_unichar(const char *str)
+{
+	int unichar;
+	int len;
+	int i;
+
+	len = utf8_encoded_expected_len(str);
+	switch (len) {
+	case 1:
+		return (int)str[0];
+	case 2:
+		unichar = str[0] & 0x1f;
+		break;
+	case 3:
+		unichar = (int)str[0] & 0x0f;
+		break;
+	case 4:
+		unichar = (int)str[0] & 0x07;
+		break;
+	case 5:
+		unichar = (int)str[0] & 0x03;
+		break;
+	case 6:
+		unichar = (int)str[0] & 0x01;
+		break;
+	default:
+		return -1;
+	}
+
+	for (i = 1; i < len; i++) {
+		if (((int)str[i] & 0xc0) != 0x80)
+			return -1;
+		unichar <<= 6;
+		unichar |= (int)str[i] & 0x3f;
+	}
+
+	return unichar;
+}
+
+/* expected size used to encode one unicode char */
+static int utf8_unichar_to_encoded_len(int unichar)
+{
+	if (unichar < 0x80)
+		return 1;
+	if (unichar < 0x800)
+		return 2;
+	if (unichar < 0x10000)
+		return 3;
+	if (unichar < 0x200000)
+		return 4;
+	if (unichar < 0x4000000)
+		return 5;
+	return 6;
+}
+
+/* check if unicode char has a valid numeric range */
+static int utf8_unichar_valid_range(int unichar)
+{
+	if (unichar > 0x10ffff)
+		return 0;
+	if ((unichar & 0xfffff800) == 0xd800)
+		return 0;
+	if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
+		return 0;
+	if ((unichar & 0xffff) == 0xffff)
+		return 0;
+	return 1;
+}
+
+/* validate one encoded unicode char and return its length */
+static int utf8_encoded_valid_unichar(const char *str)
+{
+	int len;
+	int unichar;
+	int i;
+
+	len = utf8_encoded_expected_len(str);
+	if (len == 0)
+		return -1;
+
+	/* ascii is valid */
+	if (len == 1)
+		return 1;
+
+	/* check if expected encoded chars are available */
+	for (i = 0; i < len; i++)
+		if ((str[i] & 0x80) != 0x80)
+			return -1;
+
+	unichar = utf8_encoded_to_unichar(str);
+
+	/* check if encoded length matches encoded value */
+	if (utf8_unichar_to_encoded_len(unichar) != len)
+		return -1;
+
+	/* check if value has valid range */
+	if (!utf8_unichar_valid_range(unichar))
+		return -1;
+
+	return len;
+}
+
+/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
+int util_replace_chars(char *str, const char *white)
+{
+	size_t i = 0;
+	int replaced = 0;
+
+	while (str[i] != '\0') {
+		int len;
+
+		/* accept whitelist */
+		if (white != NULL && strchr(white, str[i]) != NULL) {
+			i++;
+			continue;
+		}
+
+		/* accept plain ascii char */
+		if ((str[i] >= '0' && str[i] <= '9') ||
+		    (str[i] >= 'A' && str[i] <= 'Z') ||
+		    (str[i] >= 'a' && str[i] <= 'z')) {
+			i++;
+			continue;
+		}
+
+		/* accept hex encoding */
+		if (str[i] == '\\' && str[i+1] == 'x') {
+			i += 2;
+			continue;
+		}
+
+		/* accept valid utf8 */
+		len = utf8_encoded_valid_unichar(&str[i]);
+		if (len > 1) {
+			i += len;
+			continue;
+		}
+
+		/* if space is allowed, replace whitespace with ordinary space */
+		if (isspace(str[i]) && strchr(white, ' ') != NULL) {
+			str[i] = ' ';
+			i++;
+			replaced++;
+			continue;
+		}
+
+		/* everything else is replaced with '_' */
+		str[i] = '_';
+		i++;
+		replaced++;
+	}
+
+	return replaced;
+}